old mode 100644
new mode 100755
--- a/xpcom/io/nsLocalFileWin.cpp
+++ b/xpcom/io/nsLocalFileWin.cpp
@@ -1200,17 +1200,17 @@ CleanupHandlerPath(nsString& aPath)
 
   int32_t lastCommaPos = aPath.RFindChar(',');
   if (lastCommaPos != kNotFound)
     aPath.Truncate(lastCommaPos);
 
   aPath.Append(' ');
 
   // case insensitive
-  uint32_t index = aPath.Find(".exe ", true);
+  int32_t index = aPath.Find(".exe ", true);
   if (index == kNotFound)
     index = aPath.Find(".dll ", true);
   if (index == kNotFound)
     index = aPath.Find(".cpl ", true);
 
   if (index != kNotFound)
     aPath.Truncate(index + 4);
   aPath.Trim(" ", true, true);